import 'package:flutter/material.dart';
import 'package:list_group_handler/list_view_group.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
        // This makes the visual density adapt to the platform that you run
        // the app on. For desktop platforms, the controls will be smaller and
        // closer together (more dense) than on mobile platforms.
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
      _list.add(_counter.toString());
    });
  }

  ListViewGroupHandler _groupHandler;
  List<String> _list = <String>[];

  @override
  Widget build(BuildContext context) {
    _groupHandler = ListViewGroupHandler(
      //日志开关
      openLog: true,
      //分组数量，需要自行根据data设置，默认1
      numberOfSections: 1,
      //每组cell个数，需要自行根据data设置
      numberOfRowsInSection: (section) => _list.length,
      //indexPath: IndexPath(section,row,index)
      cellForRowAtIndexPath: (indexPath) => Text(_list[indexPath.row]),
      //头部
      header: () => Text("header"),
      //占位Placeholder
      emptyPlaceholder: () {
        return Center(
          child: Text("暂无数据！"),
        );
      },
    );

    return Scaffold(
        appBar: AppBar(
          // Here we take the value from the MyHomePage object that was created by
          // the App.build method, and use it to set our appbar title.
          title: Text(widget.title),
        ),
        floatingActionButton: FloatingActionButton(
          child: Icon(Icons.add),
          onPressed: () => _incrementCounter(),
        ),
        body: ListView.builder(
          itemBuilder: (context, index) => _groupHandler.cellAtIndex(index),
          itemCount: _groupHandler.allItemCount,
        ));
  }
}
